Wall bolt-holder



1.]. MULKERN.

WALL BOLT HOLDER.

AFFLICATION FILED AUGZ, 1919.

Patented Aug. 17, 1920.

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UNITED STATES JOHN J'. MULKERN, OF CAMBRIDGE, MASSACHUSETTS.

WALL BOLT-HOLDER.

Application filed August 2,

To all whom it may concern Be it known that JOHN J. MULKERN, a citizen of the United States of America, residing at Cambridge, in the county of Middlesex and State of Massachusetts, has invented an Improvement in \Vall Bolt-Holders, of which the following is a specification. eretofore many devices of complicated and expensive construction have been made for the purpose of wall anchors or devices in the nature of expansion bolts; but my improvement in wall-bolt holders is a simplification in the construction of such devices and at great reduction sists in a relatively thin strip of flexible metal the ends of which near its middle portion, are bent at right angles to its length, thus a little beyond this fiat section, back upon itself, which produces a projecting ledge to engage the sides of the boltnut and prevent it being turned when the screw-bolt is turned.

These bent ends extend back parallel to the shank of the bolt, and upon the side next to the bolt are scored or creased across their surface to determine the place of maximum expansion oi the strip and where it will first bend outward when pressure is brought upon the seat by turning the screw-bolt and drawing the nut inward, with the ends of the strip resting against the plate or surface of the device which is to be secured against .the wall.

A single strip thus bent into the form described may be used when the plate or other thing to be secured to the wall is not heavy nor to be subjected to great strain, but I prefer to use a pair of these devices interlocked with the flat sections superposed and the long ends of each extending back parallel to he shank of the bolt and with the pressed these long and engage the wall in four diflerent directions.

In the drawings forming a part of this specification, Figure 1, is an elevation of a single strip of metal bent into the desired shape and a section of wall with a bolt extending through the plate and the wall to which it is to be secured, and a nut engaged Specification of Letters Patent.

Patented Aug. 17, 1920.

1919. Serial No. 314,923.

1n Fig. 1, before being compressed as in Fig. 3 Fig. 7, is a vlew of a single strip, in elevation, as in F 1g. 6, with a similar interlocking strip placed at right seat S, that \Vhen the holder is compressed only the edges of the strips will bear against the wall within the hole, as seen in- Fig. 4.

eferring to the drawings by reference characters, TV, is a section of wall to which the plate P, is to be secured; C, C, arethe angles to its length to form a seat S, for the nut N, and then bent back upon itself to form the nut engaging ledges L and the legs or sides C, C, of the holder. The sides C, C, extend parallel with the screw-bolt B, which passes through the plate P, between the sides C, C, and C, C, through the hole H, in the seat S, and engages the nut H, resting in the seat S, within the ledges L.

The sides or legs C, C, of the holder are scored or creased upon their inner surfaces as at (Z, to determine the place where the strips will first bend outward when compressed by the nut N, through the action of the screw-bolt'B, and also the location of the maximum expansion of the strips when thus caused to collapse.

lVhen the sides C, C, of the holder are expanded as shown in Fig. 3, they engage the wall at the sides of the hole through which the holder passes and secure the plate P, against the other side of the wall, as shown in Figs. 1 to 3.

The bolt-holder will be found very inexpensive to manufacture and in the material used, easily applied, and perfectly secure in its peration.

claim:

1. A wall bolt-holder, consisting of a flexible metal strip a section of which is bent at right angles to its length and beyond that section bent backward upon itself to such seat section form a seat for the bolt-nut and engagement for its sides, and provided with a hole in for the passage of the bolt; the turning of which will draw the nut inward and cause the flexible sides of the holder to expand.

2. A wall bolt-holder, consisting of a pair of flexible metal strips the two ends of each being bent at right angles to their length, thus forming a flat seat for the bolt-nut and provided with a hole in such fiat portion for the bolt, the ends of the strips beyond such seats being bent backward upon themselves to form ridges to engage the sides of the nut; these bent strips being adapted to interlock, with the right angled seat portions superposed and their ends parallel with and surrounding the bolt.

3. A wall-bolt holder, consisting of a pair of flexible metal strips each of which is bent near its middle portion at right angles to its length, to form a seat for the bolt-nut, with a hole through the seat for the bolt,, and beyond such seat a portion of each end of each strip being bent backward upon itself thus forming projections which engage the sides of the nut, and havingthe inner surface ofthe strips creased between the seat and the ends of the bent back portions, to determine the location of their maximum expansion when caused to collapse and engage the encompassing wall, by the force of the nut upon the seat when drawn inward by the action of the screw bolt.

JOHN J. MULKERN. 

